The Brooklyn Bridge–City Hall/Chambers Street station is a New York City Subway station complex in Lower Manhattan. The complex is served by trains of the IRT Lexington Avenue Line and the BMT Nassau Street Line. The station is served by the 4, 6, and J trains at all times; the 5 train at all times except late nights; the train on weekdays in the peak direction; and the Z train during rush hours in the peak direction. The complex comprises two stations, Brooklyn Bridge–City Hall and Chambers Street. The Brooklyn Bridge–City Hall station was built for the Interborough Rapid Transit Company (IRT), and was an express station on the city's first subway line. The station opened on October 27, 1904, as one of the original 28 stations of the New York City Subway. The Chambers Street station was built for the Brooklyn Rapid Transit Company (later the Brooklyn–Manhattan Transit Corporation, or BMT) as part of the Dual Contracts. The Nassau Street Line station opened on August 4, 1913. Several modifications have been made to both stations over the years, and they were connected within a single fare control area in 1948. The Lexington Avenue Line station, under Centre Street, has two island platforms, two side platforms, and four tracks; the side platforms are not in use. The Nassau Street Line station, under the Manhattan Municipal Building, has three island platforms, one side platform, and four tracks; only the outer tracks and two of the island platforms are in use. The complex contains elevators that make it compliant with the Americans with Disabilities Act of 1990. History The two adjacent stations on the IRT Lexington Avenue Line and BMT Nassau Street Line are connected by two passageways. The south one opened in 1914, and was placed inside fare control on July 1, 1948. A second passageway, at the north end of the stations, was opened in the evening of September 1, 1962, when the Lexington Avenue Line platforms were extended and the Worth Street station was closed. Originally, the stations were operated by separate companies: the Interborough Rapid Transit Company (IRT) and the Brooklyn–Manhattan Transit Corporation (BMT). The city government took over the BMT's operations on June 1, 1940, and the IRT's operations on June 12, 1940. Both sections of the station complex were listed on the National Register of Historic Places in 2005. IRT Lexington Avenue Line Construction and opening